Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 109
k, and most suit-able for the use of those making a scientific study of illuminants. Thelist of accessories which may be fitted to this instrument is large, andeach accessory is provided with all possible adjustments. The Willyoung No. 1 Station Photometer has been designed especiallyfor large… … Fig. 91. W4581-W4583. Reichstanstalt Precision Photometer. 105 The Willyoung No. 2 Station Photometer is a more simple and lessexpensive instrument than the No. 1, although comprising essentially thesame elements. It is made with accuracy and may be relied upon to doexcellent work with considerable…
Electric apparatus and appliances · Equipment and supplies
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