Pringle, Andrew · New York : Scovill & Adams Company of New York · leaf 20
a slide ; we have others to consider. The size of a slide plate is three and one- quarter inches square, there is no reason for changing this size, or for adopting any other. But the frame of our picture — the “mask,” technically — requires consideration. Why we should adopt for slides shapes and…
Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Omnia D. And. Alciati Emblemata : ad qvae singula praeter concinnas acutásque inscriptiones, lepidas & expressas imagines, ac caetera omnia, quae prioribus nostris editionibus cùm ad eorum distinctionem, tum ad ornatum & correctionem adhibita continebantur, : nunc primùm perelegantia persubtiliaq́ [ue] (1564)](https://img.insideoutlibrary.com/img/200/ia-omniadandalciati00alci-165-170.webp)
