Reduced to a single-channel version of the Telop, the Telop III also added a remote-control for switching up to 50 cards, and added heat filters for opaque cards.
2.
Shows in England and Europe, in contrast, used modified 2 " sq . slide projectors which had their Dichroic heat filters ( one or both ) removed and employed two layers of slide cover glasses with two liquids ( oil and water based, in the early days ) between each layer.
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