specifications for hand-operated grain hopper scales, C199.

Scientific literature relating to helium, C81.

Scleroscope hardness, T11.

Scouring, wool fleece and mohair yarns, T273.
Scratch coat, C205.

Screen, luminosity, S303.

shielding, radio measurements, S471.

Screens, color, pyrometer, S260.

glass, compared with tungsten lamps, S277. see also Sieves.

Screw Thread Commission, 1924 report, M61. progress report, M42.

gauges, M42, M61. pitches, M49, M61. threads, M42.

thread diameters, C140, M42, M61.

pitches, graphic comparison of, M49. tap drill sizes, M61.

taps and cutting tools, M61.

tolerances, M42, M61.

Screws, measurements, C2, M61.

wood, Government specifications, C140, M61.

Sea water, effect upon cements, T12.

annual conferences, M4, M5, M6, M7, M8, M9,

MIO, MII, M12, M13, M14, M41, M43, M48, M55,

M 59.

*state, functions, M11, M41, M48.

weights and measures, Mi, M4.

*Sealing, methods of, M11.

weights and measures equipment, Mr.

Seams, tests, T96.

photo-electrical, S446, S451, S456.
spectrophoto-electrical, S446.

photo-electrical, of bismuthinite, S322.

spectral photo-electric, of silver sulphide, S344. spectrophoto-electrical, of proustite, S412, tests of Thomson galvanometer, S282. thalofide, $380.

Sensitizing photographic plates by bathing, S422.
Sensitometry of photographic emulsions, S439.
Separators, storage battery, T271.

Serialization law in Pennsylvania, M51.
Series in molybdenum, S474.

Serpentine standards of inductance, S15.

Service from domestic gas appliances, C116. standards, electric, C56.

gas, C32.

of quality and safety, C68.

telephone, C112.

Set, generator, S25.

millboard, R19.

in bed blankets, RI.

in hollow building tile, R12.

in face and common brick, R7.

in files and rasps, R6.

in forged tools, R17.

in hotel chinaware, R5.

in lumber, R16.

in metal lath, R3.

in milk bottles and milk-bottle caps, RIO.

in paper sizes, R22.

in range boilers and expansion tanks, R8.

in roofing slate, R14.

what it is and what it offers, RXI.

Single layer coils, S31.

polygonal coils, S468.

self-inductance, S31, S169, C74.

Single-tier steel lockers, R35.

Sink-head ingots, T178.

Sink traps, brass lavatory and, R21.

Size of hosiery, C149.

Sizes in wire gages, C67.

of paving bricks, bedsteads, mattresses, springs, etc., R1, R2.

of rolls of fencing (packages), R9.

Skin effect, S76, S169, S252, S374, C74. coils, S76.

electrical resistance, $430.

inductance coils, S430.

return circuit, S374.

wires, S252.

Slab beams reinforced diagonally, T233.

hollow tile and reinforced concrete, test, T236. test of tile and concrete floor, T220.

Slabs, hollow tile and concrete, tests of, C261.
Slag, C158.

Slate, C158.

blackboard, R15.

roofing, simplified practice in, R14.

structural, R13.

Slushing oil, C200.

Slushing oils, T176.

Smokeless powder, T98.

test, SI02.

Soap, T273.

automobile, laboratory examination, C127. sampling, C127.

specification, C127.

bubbles, bullets going through, S508.

loading, H4.

measuring apparatus to be tested, C2.

ordinary laundry soap, C129.

paint, applicability of, T274.

paper bags for cement and lime, T187.

pipe threads, M42, M61.

primary batteries, C79.

proposed for silver volta meter, S285.

rubber products, C38.

sand-lime brick, C109.

screw threads, M42, M61.

slushing oils, T176.

special grade laundry soap, C62.

specification and tests for the transparency of
paper and tracing cloth, C63.

for and method of testing soaps, C62.
specifications and tolerances for weights and
measures and weighing and measuring de-
vices, C61, H1. See also Reports, annual,
Conferences on Weights and Measures.
for and measurements of standard sieves, C39.
for hand-operated grain hopper scales, C199.
for marine sextants, Cr10.

for the manufacture and installation of rail-
way track scales, C83.
standard cells, S67.

limestone and quicklime for use in the manu-
facture of sulphite pulp, C144.

limestone, quicklime, and hydrated lime for
use in the manufacture of glass, C118.
limestone, quicklime, lime powder, and hy-
drated lime for use in the manufacture of
sugar, C207.

quicklime and hydrated lime for use in the ab-
sorption of carbon dioxide, C189.

for use in the cooking of rags for the manu-
facture of paper, C96.

for the manufacture of silica brick, C153.
for use in the manufacture of calcium arse-
nate, C203.

for use in the purification of water, C231.
for use in the manufacture of sand-lime brick,
C150.

quicklime for use in causticizing, C143.
United States Government master, for-
asbestos high-pressure rod packing, C238.
asbestos metallic-cloth gaskets, C242.
asbestos metallic-cloth sheet packing, C243.
asphalt for mineral-surfaced roofing, C159.
asphalt for unsurfaced built-up roofing, C168.
asphalt for waterproofing and damp proofing,
C160.

asphalt prepared roofing, C192.

asphalt primer for roofing and waterproofing,
C162.

asphalt-saturated rag felt for roofing and water-
proofing, C161.

asphalt varnish, C104.
automobile soap, C127.

general specifications for rubber goods (methods
of physical tests and chemical analysis), C232.
gloss interior lithopone paint, white and light
tints, C147.

green paint, semipaste and ready mixed, C97.
grit cake soap, C130.

gypsum plaster, C205.

gypsum plaster board, C210.
gypsum wall board, C211.
hand grit soap, C132.

heavy rust-preventive compound, C200.
hectograph ribbons, C187.

helmet-shaped ice bag, C228.

hydrated lime for structural purposes, C204.
indelible marking ink for fabrics, C197.
indigo blue denim (unshrunk), C266.
indigo blue denim (shrunk), C265.
interior varnish, C117.

iron oxide and iron hydroxide paints, C93.
installation of metal flashings with bituminous
built-up roofing, C180.

installation of plastic flashings with bituminous
built-up roofing, C181.

lace leather, C213.

liquid soap (for laundry use), Cr93.

low pressure spiral gland packing, C237.
medium and light rust-preventive compounds,
C214.

milled toilet soap, C194.

numbered cotton duck, C136.
ocher, dry and paste, C91.

oil suction and discharge hose, C209.

olive drab paint (semipaste and ready mixed),
C165.

ordinary laundry soap, C129.

outside white titanium-zinc paint (semipaste

and ready-mixed), C215.

plain, inlaid, and printed linoleum, C190.

pneumatic tires, solid tires, and inner tubes,
Cu5.

politzer bags, C222.

Portland cement, C33.

powdered soap (for laundry use), C195.

putty, C216.

Specifications-Continued.

United States Goverment master, for-Contd.
stomach or lavage tube, C220.

surfacing materials for bituminous built-up
roofing, C158.

surgeons' rubber gloves, C217.
surgeons' rubber aprons, C247.
surgical operating pads, C245.

tent duck (special construction for bleaching
or dyeing, grey), C167.

titanium pigment, dry and paste, C163.
tucks, packing, C233.

turpentine (gum spirits and wood turpentine),
C86.

typewriter ribbons, C186.
upholstery leather, C212.
vitrified chinaware, C202.

volatile mineral spirits for thinning paints, C98.
water resisting red enamel, C146.
water resisting spar varnish, C103.

white cotton rags for wiping machinery (ster-
ilized), C264.

white floating soap (for toilet use), C123.

white paint and tinted paints made on a white
base, semipaste, and ready mixed, C89.

star, measurements of energy distribution, S438.
stellar, photographing, S318.

wave-length measurements, S312.

wave lengths, see Wave lengths in spectra.
yttrium, lanthanum, and cerium, S421.

Spectral center of gravity, S443.

classification and excitation of arsenic, antimony,

bismuth, and nitrogen, S490.

composition of searchlight arcs, T168.

distribution of energy by Planck's equation,
tables and graphs, M56.

distribution of energy to evoke the gray sensation,
S417.

energy distribution of a star, S438.

energy of the carbon glow lamp, S132.

of the firefly, S132.

lines, standard, S168.

photoelectric sensitivity of silver sulphide, S344.

radiation constants, S204, S284.

of a black body, S406.

reflection of molybdenite, S325.

reflection of Munsell color standards, T167.

transmission of the atmosphere, S389.

of various substances, S325.

transmittancy of dyes, $440.

Spectrograph, photographic, S422.
quartz rock salt, S441.

Spectrographic analysis, S444.

Spectrophotoelectric sensitivity of thalofide, $380.
of proustite, S412.

Spectrophoto-electrical sensitivity, S446, S451, S456.
Spectrophotometer, pocket, S39.
Spectrophotometry, S440.

photoelectric, by null method, S349-
Spectropyrheliometer, S378.
Spectroradiometers, S279.

of quartz, fluorite, rock salt, and sylvite, S401.

Spectroradiometric transmission data, S418.
Spectroscopes, photometric attachment, S155.
Spectroscopic notes, S441.

Spectroscopy, see Reports, annual, of the director.
Spectrum, acetylene flame, S362.

analysis, S477.

gas, S251.

tubes, preparation of, S441.

visibility of radiant energy in, S475.
visible, of acetylene flame, S279.
Speed of photographic plates, S439.
Sperm candle, S227.

Sphere, integrating photometric, S447.

Ulbricht, for measuring reflection factors. S415.
Spherical aberration of thin lenses, S461.

candlepower, measurement by sphere, S441.
Spindle, mooring, T270.

Spiral gland packing, low-pressure, C237.
Spirals, inductance, S455.
Springs, bedstead, sizes, R2.

Square coils, inductance, S468.

Stability test for smokeless powder, S192.
Stabilized-platform weighing scale, T106.
Staining of fibers for photomicrography, T217.
Stainless steel, thermal expansion, S426.
Stamp-pad ink, specification for, C185.

Standard absorption bands, radiometric investi-
gation, S168..
acidimetric, S183.

barrel law, Federal, C71, Mr.

Baumé hydrometer scales, C59.
boxes, T253.

bushel, Cro.