3rd In a large percentage of installations mazda lamps are used exclusively.

4th The introduction of mazda lamps for street lighting has been very pronounced during the past year.

5th A majority of the companies installing mazda lamps during the past year for street lighting have applied the new equipment in substitution of other illuminants.

6th In a majority of the installations made during the past year both for new lighting and on account of replacing other illuminants the Type C lamp has been used.

7th More carbon arc lamps have been replaced than any other type of illuminant.

8th The Type B (series lamp) has been replaced by the Type C very generally.

9th In a majority of cases where the Type B lamp has been replaced by the Type C the candlepower has been increased. (See Fig 21 above referred to)

In addition to answering specific questions asked by your Committee a very large percentage of the replies from member companies included direct requests for information of varied and miscellaneous character concerning incandescent lamp matters and an endeavor has been made, so far as possible, to answer these questions and provide the information asked for.

New York City

It may be interesting to the members to present rather fully the up-to-date situation with regard to New York City, inasmuch as the municipal authorities have adopted as a general standard for street illumination the mazda lamp with particular reference to the Type C. In the report submitted last year it was stated that the City of New York had installed a number of mazda C lamps during the latter part of 1914. This equipment represented trial installations of the multiple type in the 300, 400, 500 and 750-watt sizes and the 400 and 600-candlepower sizes in the series type. The experience gained during some six months trial decided for the elimination of the enclosed carbon arc lamp as a street lighting unit in this city and the several companies supplying street lighting service in the various boroughs of Greater New York have proceeded with the replacement of their arc lamp equipment so that by the time this report goes to press all the

p for street lighting in this city will have disappeared, replaced with mazda C lamps, the authorities standardizthe 300 and 400 watt multiple mazda lamp and the 400ewer series lamp.

Lam; in general are installed at the mounting heights. the are lamps which they replace, enclosed in an alabaster ot light diffusing glass. The general types of housing escribed in last year's report. For series operation both ator and straight scries and in some instances a combinaof with are used.

replacen ent of are lamps has been practically on a lamp •lar; basis using the 400 to 500 candlepower mazda Clamp r a few isolated cases where the 100-candlepower lamp silitt rted in the ratio of three lamps of this can l'e one arc, these cases being mostly in outlying districts at tree lined thoroughfares. The installation has found far with the municipal authorities and extensions of the street service are restricted where large units are required to ey of mazda ( lamps now standardized

It was stated last year that the authorities in this city org consideration to the possible use of a 200 watt le marda Cunit with proper spacing for side street (resialilmmation. During the latter part of 1915, the authordes deviled to replace such gas or naphtha lamps as could be ertly served from the mains of the lighting companies e Tape ( lamps The substitution thus far undertaken the replacement of some 10.000-60 cp We! bach gas and for en h reply-ement in the outlying districts the 100 smarda Clamps was designated on a lanp for lan ↑ tany, while in the built up sections of the city, in residential the 20 watt multiple mazda (Lamp was determined im as the substitute for the gas mantle Lamp Some 2500 of this size and type have been installed during the past ator the sections of the city referred to above

bet! of the installation of this 200 watt Timp may be of

Figs 22 and 23 illustrate the type of posts used for these 200-watt units, the bracket type being the standard equipment while the mast arm design is used in special cases where streets are heavily shaded by trees or are of the boulevard character. The installation of this 200-watt mazda C unit for street

FIG 22-STREET LIGHTING UNIT, NEW YORK CITY, BRACKET TYPE FOR 200WATT MAZDA C LAMP

lighting emphasizes the possibilities of a unit of somewhat lower intensity than has heretofore been used when enclosed in a diffusing medium. The availability of a unit of this character as one to supplement those of higher intensity installed in adjacent streets or districts, permits of an extension to existing street lighting systems where the 100-cp or 100-watt lamp did.

wrve this purpose to the full The 250 cp lamp is the valent unit for series distribution and lends itself readily the same purpose.

As emphasizing the extent to which the installation of the lamp for street lighting for the several Boroughs of

ty of New Yik has proceel, te fol wing ta'ala

is near, 60** Las of the va be interesting, it be ng n tel tit

te au

The City of Chicago was one of the first municipalities to appreciate the possibilities of the mazda C series incandescent lamp for street lighting. The results of the standardization of this type of unit in several sizes for the various classes of service have been satisfactory. The standardization or equipment has included that applicable to lamp housings, lamp posts and street fixtures, making for a pleasing result by day as well as by night.

For the business streets and similar thoroughfares requiring high intensity the 600-cp mazda C lamp as been standardized, suspended 30 feet above the surface of the street. The lamps are enclosed in diffusing globes with light alabaster glass of a density low in absorption value.

The spacing of these lamps in business sections of the city and similar locations is approximately 250 feet apart and where supplied from the underground system they are placed alternately on both sides of the street. Lamps supplied from overhead conductors are placed on one side of the street. The lamp post is a combination of heavy steel tubing as the vertical sustaining member, to which is fastened a substantial iron bracket for the lamp suspension.

In the residental and parked streets the unit in service is the 100-cp mazda C lamp enclosed in a ball globe of diffusing characteristics, vertically installed or "tip up," and a cast iron capital applied to the gas base formerly in use. This unit is installed approximately 70 to the mile and provides most satisfactory illumination for residential districts.

It is reported that the extension of the Type C lamps will be continued and that the future will see the replacement of